Hot-air heater



T. C. SEBRING. HOT AIR HEATER. APPLICATION FILED APR. 8. 1919.

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WI T NESS m m mam A UN W1 A S M? T. c. SEBRING. HOT AIR HEATER.APPLICATIQN FILED APR. 8, 1919- 1,437,451 Q Patented Dec. 5, 1922.

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UMT srrss THEOSIS C. SEEKING, 0F

HOT-AIR Application filed April 8,

To all whom it may concern:

Be it known that I, Tnnosrs C. SEEKING, a citizen of the United States,residing at Blissfield, in the county of Lenawee and State of Michigan,have invented certain new and useful Improvements in Hot-Air Heaters;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

The present invention relates to stoves and furnaces, and particularlyto hot air heaters, it being the object of the invention to provide anair heating furnace of novel and improved construction with provisionmade for the passage of air radially from the center of the fire pot toand out through the periphery of walls thereof, to provide for thorough,steady and eflicient combustion of the fuel and maximum heat, and toconsume all soot, gases and smoke after a bed of coals has formed.

A further object is the provision of a novel hollow tube side grate forthe fire pot, to enhance the heating of the air, and to overcome theburning out of the sides of the fire pot.

The invention also resides in other features of construction, and in theconstruction and arrangement of the component elements.

With the foregoing and other objects in view which will be apparent asthe description proceeds, the invention resides in the construction andarrangement of parts here inafter described and claimed, it beingunderstood that changes can be made within the scope of what is claimedwithout departing from the spirit of the invention.

The invention is illustrated in the accompanying drawings, wherein 7Figure 1 is a vertical median section of the furnace embodying thepresent improvements.

Figure 2 is a fragmentary section taken on the line 2-2 of Figure 1.

Figure 8 is a fragmentary elevation look ing from the interior of thefire pot and showing several of the grate tubes, portions being shown insection.

Figure 4: is a section on the line 44 of Figure 2.

Figure 5 is a diametrical section of a r modified form of air inlet domefor the fire pot.

BLISSFIELD, JMEICHIGAN.

HEATER.

1919. Serial No. 288,517.

The structure is'enclosed or housed by a suitable casing or jacket 1provided with a lower fresh air inlet 2, and its upper air inlets 3 toconvey the heated air to the rooms of the buildings. tion or floor is abase 4: comprising an arcuate wall located centrally within the casing 1and supporting the arcuate or annular wall of the fire pot 5 which hasits lower edge seated on the upper edge of the base 4. The fire pot 5 inturn supports the fuel magazine or chamber 6, which may be -of anysuitable form, and this extends upwardly to the top of the casingcentrally thereof. The fuel magazine or'chamber 6 is provided near theupper end thereof with an outlet 7 for the products of combustionleading to the vertical flue 8 in the casing at the rear of the magazineand opening upwardly through the top of the casing for connection withthe chimney. The damper or valve9 is mounted within the outlet 7 tonormally close the same, and permitting said outlet to be opened when anupdraft is desired from the fire pot up through the magazine containingthe coal or other fuel.

The top of the casing has a fuel door 10 over the magazine, permittingfuel to be dumped downwardly into the magazine, and said magazine alsohas a laterally extending chute 11 leading to a fuel door 12 in thefront wall of the casing, and permitting the fuel to be delivered intothe magazine through said chute, which is more convenient than liftingthe fuel over the casing. A valve 13 is suspended from the top casing atthe inner end of the chute, to normallyswing downwardly and close the inner end of the chute, said valve swingingopen inwardly when coal orother fuel'is delivered into the magazine.

The wall of the fire pot 5 has a front opening 14: for removing clinkersand tending to the fire, and an enclosed passage 15 has a trap door 17that can be -swung open to permit the clinkers to drop downwardly intothe ash pit. This ash pit is provided by a horizontal partition withwhich the base 4 is provided, and said partition separates thesuperposed ash pit 19 and fresh air compartment 20 which extend to thefrontwall of the casing-1 that is provided with the respective ash andair draft doors 21 and 22. The partition 18 has an opening 18 andMounted on the founder-- of the ash; plates 18 therein which are mountedon fulcrums so that they can be tilted for dumping the. ashes into thecompartment 20. The door 22 can be opened for removing the ashes, and tocontrol the draft.

An. arcuate bustle pipe 23 surrounds the fire pot and extends almostthrough a complete circle, with its ends terminating at the oppositesides of the passage 15, and this pipe 23 has a horizontal partition 24therein extending from one side of said pipe to the other at the rear ofthe furnace, which provides a battle for the products of combustion. Thewall of the fire pot is provided with outlets 25 extending radiallytherefrom and communicating with the pipe below the horizontal plane ofthe partition 24, and, as shown, there are four outlets 25 disposed inthe oblique lines as seen in Figure 2, and the partition 24 terminatesbetween the outlets at the opposite sides and extends below the flue 8leading up from and connected to the pipe 23 at the rearof the magazine6. A vertical partition 26 closes the passage in the pipe 23 underneaththe partition 24 at the rear. Therefore, the products of combustion inpassing through the rear outlets 25 into the pipe 23 below the partition24, must pass forwardly under said partition and thence upwardly acrossthe ends thereof, while the products of combustion which pass throughthe forward outlets 25 pass rearwa-rdly and upwardly in the pipe 23 overthe ends of the partition 24. In this way, the partition or baffle 24causes the products of the combustion from the rear outlets 25 tomovethrough the same distances as from the forward outlets 25, and avoidsthe direct passage of the products of combustion from the rear outlets25 to the fine 8 as would otherwise occur. This results in theconservation of heat, and renders the draft through the several outlets25 uniform, to render the burning of the fuel also uniform around thewall of the fire pot. This bustle pipe 23 will be heated by the productsof combustion flowing therethrough, and the heat will be dissipated orradiated to the fresh air which flows upwardly within the casing 1 fromthe inlet 2 to the outlets 3, the air flowing on boththe inner and outersides of the pipe 23 which is spaced concentrically between the casing 1and fire pot. The ends of the pipe 23 having openings 27 permitting saidpipe to be cleaned out, and these openings are normally closed by slides28 that can be raised to permit fine ashes to be removed from said pipe.1

The fire pot is provided therein with a hollow tube grate providing aslotted grate adjacent to the side wall of the fire pot, and for thispurpose, the upper edge portion of the fire pot 5 is offset inwardly, toprovide the shoulder 32 and flange 31 which supports the magazine 6. Anarcuate vertical grate is provided within the fire pot, composed ofvertical tubes 33 which have their upper ends 'a dome 42 of the centerinserted within openings in the shoulder 32, and the lower portions ofsaid tubes extend angularly outward, as at 34, and are seated within airinlet openings 35 with which the wall of the fire pot is provided nearthe lower edge thereof. The tubes 33 can be disposed in inclined as wellas vertical positions, according to the shape of the grate desired, andit will therefore be understood that the portions 34 can be disposed atvarious angles with the tubes The tubes are spaced apart to form thegrate, the bars of which are hollow, and said tubes are spaced from thewall of the fire pot thus providing an annular or arcuate air spacesurrounding the grate through which the products of combustion cancirculate to pass through the outlets 25. Fresh air can flow through theopenings 35 and tubes or grate bars 33 to greatly facilitate the heatingof the air, and to also cool the grate bars, thereby preventing the firepot from burning through, so that the tubular grate bars are ofadvantage in several respects. The tubes 33 are provided near theirlower ends with side lugs 36 that contact with one another, thus servingto space the tubes apart, and prevent them from warping out of shape atthe elbows thereof. Said tubes are further provided at their inner sidesand adjacent to their elbows or lower ends, with inwardly extendingnotched lugs 37 roviding a seat for the base grate 38 on w ich isdisposed the rotatable grate or damper 39 having radial slots toregister with the slots of the grate 38. The grate 39 has an arm. 40extending within the passage 15 to be operated by apoker or implementinserted past the door 16, for openingand closing the slots of the grate38, to control the discharge of ashes from the fire pot, and to shakethe fuel from underneath from time to time to loosen up the ashes andfuel.

It is preferable to hingedly suspend a slotted uard 41 within theevening 14 to prevent the fuel from running through the opening 14 intothe passage 15, and permitting said guard to swing inwardly whenintroducing a poker, hook or other implement to the fire pot forremoving clinkers. This guard 41 thus permits clinkers to be withdrawnfrom underneath the coal above them.

The air is admitted into the fire potfrom. the center thereof, by meansof of the grate 38 and having slotted walls for the radial discharge ofair through, the fuel to the slotted side wall plate composed of thetubes 33. This dome 42 has a conical cap 43 secured thereon, as seen inFigure 1, to deflect the coal and fuel away from the sides of the dome42, and prevent the slots thereof from being clogged up, and alsofacilitate the passage of air through the fuel.

The bottom of the dome 42 has an air inlet tube or pipe 44% dependingtherefrom through the grate 38 and partition 18, so that the fresh aircan flow upwardly from the compartment 20 into the dome. The air thuspasses upwardly through the ash pit and is distributed radially in alldirections through the fuel in the fire pot to pass between the tubes orhollow grate bars 38, and the products of combustion can circulate inrear of the tubes 33 to pass through the outlets 25 and thence throughthe bustle pipe 4.3 to the flue 8.

The damper 9 is normally closed, so that the products of combustion areconstrained to flow through the outlets 25, but when an updraft isdesired, the damper 9 can be opened, thereby permitting some of theproducts of combustion to pass upwardly through the magazine 6 andthrough the outlet 7 to the flue 8.

By the provision of the air inlet dome i2- and the side wall grate ofthe fire pot, the air can flow radially in all directions through thefuel, thus affording uniform combustion of the fuel, and directing theheat toward the wall of the fire pot. The tubular grate bars alsoprovide for the quick heating of the air which passes therethrough, aswell as lengthening the life of the the pot structure. A furtheradvantage resides in heating the air which passes over bustle pipe 23 inwhich the products of combustion circulate before reaching theoutletfiue 8.

The modification shown in Figure t uses a nipple 45 extending throughthe shoulder 32 of the ofi'set portion 31 and having a supporting flange46, the upper end of the tube 33 receiving the nipple 15 instead ofextending upwardly through the opening, as in Figures 1 and 3. Thisconstruction will permit of expansion and contraction, and alsofacilitate the assemblage of the parts, but it will be understood thatthe tubes 33 can expand through the openings in the shoulder 32, withthe construction as shown in Figure 1.

Figure 5 illustrates a different form of dome 42 with an integral cap43.

Having thus described the invention, what is claimed as new is 1. Afurnace comprising a fire pot, a side wall grate therein composed of aircirculating tubes having their upper and lower ends communicatingthrough the wall of the fire pot, said wall having outlet openingsbetween the upper and. lower ends of said tubes, and an air inlet domecentrally of the fire pot having openings in its side walls for theradial flow of air into and through the fire pot and radially betweensaid tubes to and through said openings.

2. A furnace embodying a fire pot, a fuel magazine thereon, a side wallgrate within the fire pot composed of air circulating tubes having theirupper and lower ends communicating through the wall of the fire pot,said wall having outlet openings between the upper and lower ends ofsaid tubes, a bottom grate within the lower portions of said tubes, andan air inlet dome on said bottom grate having openings in its side wallsfor the radial flow of air into and through the fire pot and betweensaid tubes.

8. A furnace embodying a fire pot, the wall of which has lower openingsnear its lower edge, the upper edge portion of said wall being offsetinwardly and having openings, a fuel magazine supported on said upperedge of the fire pot wall, grate tubes at the inside of the fire potspaced from the wall thereof and having their upper ends communicatingthrough the last named openings and their lower end portions extendingangularly outward and supported by said wall in communication with saidlower openings, said wall having outlet openings between the upper andlower ends of said tubes, a bottom grate within the lower end portionsof said tubes, said lower end portions of the tubes having lugssupportin said bottom grate, an air inlet dome on the bottom gratecentrally of the fire pot having openings in its side walls for theradial flow of air into and through the fire pot and between said tubes,and a conical deflector on said dome for spreading the fuel from themagazine radially from the sides of the dome.

In testimony whereof l have signed my name to this specification in thepresence of two subscribing witnesses.

, THEOSTS C. SEBRTNG. Witnesses:

Pnnsron C. LUKE, CARL A. MOHN.

